Accession Number : ADA267009
Title : Progress in the Modeling of the Shock Response and Mitigation of Thick Composite Shells
Descriptive Note : Memorandum rept.
Corporate Author : NAVAL RESEARCH LAB WASHINGTON DC
Personal Author(s) : Dyka, C T ; Randles, P W
Report Date : 22 Jul 1993
Pagination or Media Count : 58
Abstract : This report is a continuation of our efforts to develop a methodology for predicting the response of thick composite materials subjected to multi- dimensional shock loadings. A focus of this work has been the initiation and evolution of damage in 1D, 2D and 3D composite structures. In addition, dispersion/viscoelastic models have been investigated for 1D structures and implemented. One dimensional damage predictions are made for composite plates subjected to underwater shock. The 1D and 2D continuum damage models are both applied to the impact of a plexiglass flyer and graphite/peek plate, and the results compare very well to experimental data. A new 3D continuum damage theory is developed for thick laminated composite plates. The 3D theory is in part an extension of the 2D transversely isotropic damage theory. However, three dimensional considerations as well as the inefficiencies of modeling individual plies in a thick composite require a slightly different approach. A 3D formulation is developed which applies the damage directly to the stresses, rather than the compliances as in the 2D and 1D theories.
Descriptors : *THICKNESS , *COMPOSITE MATERIALS , *RESPONSE , *SHOCK , STRESSES , TRANSIENTS , IMPACT , NAVAL VESSELS , MODELS , FINITE ELEMENT ANALYSIS , ONE DIMENSIONAL , THREE DIMENSIONAL , MECHANICS , SHELLS(STRUCTURAL FORMS) , GRAPHITE , COMPOSITE STRUCTURES , POLYMETHYL METHACRYLATE , STRUCTURES , FORMULATIONS , VISCOELASTICITY , PLEXIGLAS , DISPERSIONS , UNDERWATER , PLATES , WAVE PROPAGATION , LOADS(FORCES) , LAMINATES , MATERIALS , PREDICTIONS , DAMAGE , EXPERIMENTAL DATA , METHODOLOGY
Subject Categories : Laminates and Composite Materials
Distribution Statement : APPROVED FOR PUBLIC RELEASE